[Tugindia] package, class, style

[Prof.Partha]

I have some fundamental (foolish) questions about basic LaTeX
itself.

1.  What is the official definition of a package, class, style ?

1a. How do they differ from each other ?

1b. Why do we do \usepackage when we actually want to use a style (.sty) ?

2. How do I get a list of all commands available in a package ?

Please excuse me if my questions seem foolish, or outright wrong.

partha


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